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Preparation method of silicon carbon negative electrode material, silicon carbon negative electrode material and lithium ion battery

A negative electrode material, silicon carbon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of insignificant improvement in cycle performance, unfavorable industrial development and application, and poor results.

Active Publication Date: 2020-10-30
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing methods for preparing silicon-carbon composite materials still have certain shortcomings, for example, the selection range of carbon sources is limited, the cost is high and the effect is not good, and the improvement of cycle performance is not obvious; in addition, The operation steps of the method are complicated, the reaction process is difficult to control, and the stability is poor, which is not conducive to industrial development and application

Method used

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  • Preparation method of silicon carbon negative electrode material, silicon carbon negative electrode material and lithium ion battery
  • Preparation method of silicon carbon negative electrode material, silicon carbon negative electrode material and lithium ion battery
  • Preparation method of silicon carbon negative electrode material, silicon carbon negative electrode material and lithium ion battery

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preparation example Construction

[0053] In the first aspect, this embodiment provides a method for preparing a silicon-carbon negative electrode material, comprising the following steps:

[0054] (a) using silicon monoxide as the base material, heat-treating silicon monoxide to cause disproportionation reaction of silicon monoxide to generate c-SiO;

[0055] (b) Place the c-SiO in a chemical vapor deposition furnace, raise the temperature under a protective atmosphere, and feed a carbon source after heating up to the reaction temperature, and conduct a vapor deposition reaction to obtain c-SiO / C; wherein the carbon The source is a solid or liquid compound;

[0056] (c) Etching the c-SiO / C with an etching solution to obtain the silicon-carbon negative electrode material c-SiO / Si / C.

[0057] The silicon-carbon negative electrode material prepared by the preparation method of the silicon-carbon negative electrode material provided by the present invention can overcome the defect that the single use of silicon m...

Embodiment 1

[0120] A method for preparing a silicon-carbon negative electrode material, comprising the steps of:

[0121] (a) disproportionation reaction: silicon monoxide is used as the base material, and the particle size of the silicon monoxide base material is 450 mesh, and the silicon monoxide is heated to cause disproportionation reaction of silicon monoxide to generate c-SiO;

[0122] (b) Vapor phase deposition reaction: place c-SiO in a chemical vapor deposition furnace, first purify it under the protection of argon for 0.5h, then raise the temperature to 1000°C at a heating rate of 5°C / min, and pass through the ferrocene ethanol solution , performing vapor deposition reaction for 3 hours to obtain c-SiO / C, wherein the content of C in c-SiO / C is 5wt%;

[0123] (c) Corrosion: put c-SiO / C in 5wt% hydrofluoric acid aqueous solution, stir and soak for 10 minutes, wash with deionized water, and dry at 100°C to obtain the silicon carbon negative electrode material c-SiO / Si / c.

Embodiment 2

[0125] A method for preparing a silicon-carbon negative electrode material, comprising the steps of:

[0126](a) disproportionation reaction: silicon monoxide is used as the base material, and the particle size of the silicon monoxide base material is 500 mesh, and the silicon monoxide is heated to cause disproportionation reaction of silicon monoxide to generate c-SiO;

[0127] (b) Vapor phase deposition reaction: place c-SiO in a chemical vapor deposition furnace, first purify it under the protection of argon for 0.5 h, then raise the temperature to 800 °C at a heating rate of 5 °C / min, and pass toluene for vapor phase deposition React for 2 hours to obtain c-SiO / C, wherein the content of C in c-SiO / C is 6wt%;

[0128] (c) Corrosion: put c-SiO / C in 5wt% hydrofluoric acid aqueous solution, stir and soak for 15 minutes, wash with deionized water, and dry at 100°C to obtain the silicon carbon negative electrode material c-SiO / Si / c.

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Abstract

The invention belongs to the technical field of a lithium ion battery, and relates to a silicon carbon negative electrode material and a preparation method therefor, and the lithium ion battery. The preparation method for the silicon carbon negative electrode material comprises the following steps of (a), by taking silicon monoxide as the substrate material, performing heating treatment on siliconmonoxide to enable silicon monoxide to be subjected to a disproportionation reaction to generate c-SiO; (b), putting c-SiO into a chemical vapor deposition furnace, heating in protective atmosphere until a reaction temperature is reached, and pumping a carbon source to be subjected to a vapor deposition reaction to obtain c-SiO / C, wherein the carbon source is a liquid-state or solid-state compound; and (c), performing corrosion of the c-SiO / C by a corrosive liquid to obtain the silicon carbon negative electrode material c-SiO / Si / C. The preparation method is simple in process and easy to operate; and the prepared silicon carbon negative electrode material has the high lithium storage characteristic as the silicon type material and the high cycling stability as the carbon type material, aswell as high specific capacity, high conductivity and high cycling performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a silicon-carbon negative electrode material, a silicon-carbon negative electrode material and a lithium-ion battery. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage and self-discharge rate. With the continuous development of electronic technology, higher requirements are put forward for lithium-ion batteries, which require higher energy density, better cycle life, better high and low temperature charge and discharge performance and safety performance, etc., which requires lithium The cathode and anode materials for ion batteries need to be further developed and improved. [0003] Carbon materials, such as natural graphite, graphi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCY02E60/10
Inventor 白岩马书良成信刚袁雪亚
Owner NORTHERN ALTAIR NANOTECH CO LTD
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